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This is an urgent threat to society writ large but also specifically to the military, given the importance of secure communication and secure information for defence and security. To counter this threat, we will have to completely upgrade all our secure digital infrastructure using cryptography that is ‘quantum-resistant’, i.e. secure against both quantum and classical computers.
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https://www.nato.int/docu/review/articles/2021/06/03/quantum-technologies-in-defence-security/index.html